Segment information (Tables)

12 Months Ended

Dec. 31, 2011

Segment information [Abstract]

Reportable Segments Information

(in millions)	PBM		EM		Total
2011
Product revenues:
Network revenues	$	30,007.3	$	—	$	30,007.3
Home delivery and specialty revenues		14,547.4		—		14,547.4
Other revenues		—		1,279.3		1,279.3
Service revenues		273.0		21.3		294.3
Total revenues		44,827.7		1,300.6		46,128.3
Depreciation and amortization expense		245.5		7.9		253.4
Operating income		2,288.6		23.1		2,311.7
Interest income						12.4
Interest expense and other						(299.7	)
Income before income taxes						2,024.4
Capital expenditures		141.1		3.3		144.4
2010
Product revenues:
Network revenues	$	30,147.8	$	—	$	30,147.8
Home delivery and specialty revenues		13,398.2		—		13,398.2
Other revenues		—		1,153.9		1,153.9
Service revenues		260.9		12.4		273.3
Total revenues		43,806.9		1,166.3		44,973.2
Depreciation and amortization expense		236.9		7.8		244.7
Operating income		2,061.5		9.4		2,070.9
Interest income						4.9
Interest expense and other						(167.1	)
Income before income taxes						1,908.7
Capital expenditures		116.9		3.0		119.9
2009
Product revenues:
Network revenues	$	15,019.3	$	—	$	15,019.3
Home delivery and specialty revenues		8,352.9		—		8,352.9
Other revenues		—		1,073.0		1,073.0
Service revenues		264.7		12.4		277.1
Total revenues		23,636.9		1,085.4		24,722.3
Depreciation and amortization expense		98.3		8.4		106.7
Operating income		1,490.4		7.1		1,497.5
Interest income						5.3
Interest expense and other						(194.4	)
Income before income taxes						1,308.4
Capital expenditures		145.4		2.1		147.5

Segments Reporting Information, Assets

(in millions)	PBM		EM		Total
Total Assets
As of December 31, 2011	$	15,149.9	$	457.1	$	15,607.0
As of December 31, 2010	$	10,155.1	$	402.7	$	10,557.8

Segment Information percentage of revenue by top clients

	December 31,
	2011			2010			2009
WellPoint		29.5	%		29.2	%		6.0	%
Department of Defense (“DoD”)		20.9	%		19.7	%		5.4	%
Other		6.3	%		6.3	%		12.3	%
Top five clients		56.7	%		55.2	%		23.7	%